diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index c353015..1d1c401 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -14,7 +14,7 @@ on:
 
 env:
   # Common versions
-  PYTHON_VERSION: '3.11.5'
+  PYTHON_VERSION: '3.13.5'
   DOCKER_BUILDX_VERSION: 'v0.24.0'
 
   # These environment variables are important to the Crossplane CLI install.sh
diff --git a/Dockerfile b/Dockerfile
index c53e71c..c668646 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,7 +1,7 @@
 # syntax=docker/dockerfile:1
 
 # It's important that this is Debian 12 to match the distroless image.
-FROM debian:12-slim AS build
+FROM debian:13-slim AS build
 
 RUN --mount=type=cache,target=/var/lib/apt/lists \
     --mount=type=cache,target=/var/cache/apt \
@@ -31,7 +31,7 @@ RUN --mount=type=cache,target=/root/.cache/pip \
 
 # Copy the function venv to our runtime stage. It's important that the path be
 # the same as in the build stage, to avoid shebang paths and symlinks breaking. 
-FROM gcr.io/distroless/python3-debian12 AS image
+FROM gcr.io/distroless/python3-debian13 AS image
 WORKDIR /
 COPY --from=build /venv/fn /venv/fn
 EXPOSE 9443
diff --git a/pyproject.toml b/pyproject.toml
index 803ba2c..9c4ddbc 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -6,15 +6,15 @@ build-backend = "hatchling.build"
 name = "function"
 description = 'A composition function'
 readme = "README.md"
-requires-python = ">=3.11,<3.13"
+requires-python = ">=3.12,<3.14"
 license = "Apache-2.0"
 keywords = []
 authors = [{ name = "Crossplane Maintainers", email = "info@crossplane.io" }]
 classifiers = [
   "Development Status :: 4 - Beta",
   "Programming Language :: Python",
-  "Programming Language :: Python :: 3.11",
   "Programming Language :: Python :: 3.12",
+  "Programming Language :: Python :: 3.13",
 ]
 
 dependencies = [